Band saw



Sept. 18 1923.l EASSSE D. F. GREEN ET AL BAND SAW Filed NOV. 26 1921 2Sheefs-Sheet 1 7 @gf/f7@ Qi/Z6 www sept. 1s 1923.

' D. F. GREEN ET AL BAND SAW Filed Nov. 2e. 1921 2 Sheets-Sheet 2gnbenfo/a s: Green. Jl I? 5&9.

Patented Sept. .18, 1923.

" UNITED STATES PATENT OFFICE.

DANIEL F. GREEN, OF PORTLAND, AND JOHN F. STEDMAN, OF T IGARD, OREGON;SAID GREEN ASSIGNOB T SAID STEDMAN.

BAN D SAW.

Application iiiea november as, 1921. serial m. cimas.

To all whom it my concern.'

Be it known that we, DANIEL F. GREEN and JOHN F. STEDMAN, citizens ofthe United States,residingl at Portland, count (,'5 of Multnomah, Stateof Oregon, Iand Tigar in the county of Washington and State of Oregon,have invented certain new and useful Improvements in Band Saws, of whichthe following is a specification.

The band-saw which is the subject matter of the present application forpatent has been designed more particularly for use' by butchers to sawbones, although it is not limited to such use but may be employed forany other work requiring a band-saw.

The invention has for its object to provide a band-saw embodying certainnovel and irnproved structural details and modes of operation as will bedescribed in detail hereinafter, and in order that the same may bebetter understood, reference is had to the accompanying drawings forminga part of this specification.

1n the drawings, Figure 1 is an elevation of the machme, partly insection; Fig. 2 is a plan view; Fig. 3 is a cross section 'on the line3-3 of Fig. 1, and Figs. 4 and 5 are enlarged sectional details on thelines 4 4 and 5-5, re- 3@ spectively, of Fig. 2.

Referrin specifically to the drawings, 5 denotes a and-saw passingaround bandwheels 6 and 7 the lformer being an idler and the latter thedriving wheel, power beil@ ing applied thereto in a manner to bepresently described. The drawings show the saw arranged to travel in ahorizontal plane t0 make a vertical cut downwardly but 1t may also bearranged to travel in a vertical o plane. If the saw is to be used forsawmg bones, it will usuall be portable, but this 1s immaterial, and ifesired a permanent support may be provided.

The main supporting frame of the Saw is 45 a beam 8 which'may be hungfrom a ceiling or other overhead support 9 by a cable, cord, chain', orthe like 10 fastened at one end to the beam and passing over a pulley 11 carried by the overhead support, with a 0 counterbalancing weight 12on the other end of the cable. The saw is hung above a block 13 or othersupport for the meat.

rl`he beam 8 has laterally extending end portions 14 and 15, which, inthe present instance, 'are do'wnturned.- To the end portion 14 1splvoted, as shown at 16, a support 17 for the bandwheel 6, and to theend portion 15 1s pivoted, as shown .at 18, a support 19 for theband-wheel 7. The pivots of the two band-wheel supports are horizontal.

rl`he band-wheel support 17 is a plate having an upstanding lug 17 a onits back which extends into a slot 20 in the part 14 to receive thepivot 16. On the back of the plate 17 is slidably mounted a plate 21having a bearing 22 for the shaft 23 of the bandwheel 6, said bearingbeing thus made adjustable for the purpose of moving the bandwheel toregulate the tension of the saw 5. rlhe adjustment is made by a screw 24threaded into an end lug 21a of plate 21, and carried by an end flange17b of plate 17, to whlch latter flange is also attached a loopedarm-rest 25. rlhe plate 17 may also be tilted about its pivot 16 to lineup the saw 5, this being done by a set screw 26 threaded through thepart 14 to engage the lug 17B. The plate 17 has a longitudinal slot 17'sthrough which the band wheel-shaft 23 passes, and the plate 21 has aslot 21.b through which the lug 17a passes.

rlhe plate 17 has a top groove in which the late 21 slidably seats, oneside of the groove ein undercut, and its other side being tte with aretaining strip 27 to prevent upward displacement of the plate 21.

The band-wheel support 19 is a plate having an upstanding post 28 on itsback which has its upper end reduced and seating in an aperture 29 inthepart 15 to receive the pivot 18. rllhe post 28 carries a dependinverticalshaft 30 which supports the ban wheel 7 and a spur-gear 31 abovethe latter.

A drive-pinion 32 is in mesh with the gear 31, and the side of thelatter which faces the wheel 7 is adapted to frictionally engage saidwheel to impart motion thereto for driving the saw' 5. The side of thewheel 7 has a facing 33 of leather or other friction material.

The hub ofthe gear 31 is engageableby a ball-bearing thrust plate 34,said hub having a reduced extension 31 on which the thrust plate seats,the latter' being annular. Between the hub of gear 31 and the hub of E@wheel 7 is a ball bearing thrust plate 35 for forcing the gear away fromsaid wheel to break the driving connection, said thrust plate beingoperated by springs 36 seating in recesses in the wheel hub and bearingon the thrust plate.

The thrust plate 34 is operated to jam t he gear 31 into frictional anddriving lengagement with the wheel 7 by a shifter ring 37 carried by apair of laterally spaced levers 38 straddling the post 28 and pivotedthereto at one of their ends, as shown at 39. The other ends of thelevers 38 are connected by adjustable rods 40 to bell-crank levers 41fulcrumed at 411 to the beam S, and connected by adjustable rods 42 to acontrol lever 43 also fulcrumed on said beam, as shown at 43a. The'lever 43 is adjacent to the loop 25.

In operation the meat is sliced to the bone in the usual way, afterwhich the operator slips his right hand through the loop 25, and withhis thumb presses on the control lever 43. whereby, through theconnections of said lever with the ring 37, the latter is moveddownwardly to press the thrust plate 34 against gear 31 and thereby jamthe latter into frictional and driving engagement with the wheel 7,whereupon the saw 5 is set in motion to cut through the bone. To stopthe saw, it is necessary only to release the lever 43, whereupon thesprings 3K3, through thrust plate 35, back the gear 31 away from wheel 7to break the driving connection. The gear 31 is of course loose on shaft30 so that it may be slid toward and from the wheel 7 as described.

The plate 19 has a depending end flange 44 carrying a support 45 for thelower end of shaft 30, with a ball bearing 46 between said support andthe hub of the wheel 7.

The drive pinion 32 is on a shaft 47 supported in bearings 47*1 carriedby the plate '19. This shaft may have either of its ends connected by aflexible shaft or other means to an electric motor or other powersource.

The plate 19 is pivotally supported so that it may be tilted for thesame reason as the plate 17. rllhis is done by a bushing 48 threadedinto the plate 19 and having its ends in Contact with stationaryabutments 49 on a rod 50 which extends at one end into the bushing, andis supported at its other end by the beam 8.

The wheel 6 is also provided with a scraper to keep its periphery clearof bone dust, and the saw 5 is here provided with a guide to keep it incontact with the bone being operated on. The scraper is a blade 51, andthe guide is a grooved wheel 52 engagin the back edge of the saw. Thesetwo evices are carried by a cross-arm 53 supported by and extending fromopposite sides of the plate 21. The scraper blade 51 is carried by ascrew shank 54 which is threaded into one end of the arm 53 to permitadjustment. Where the shank 54 is screwe into the arm 53, the latter issplit,

as shown at 55, and by means of a screw 55* this split portion ma bedrawn together to firmly grip the shan and lock the same to maintain theadjusted position of the scraper blade. The guide wheel 52 is carried bya; fork 56 having a screw shank 57 which is secured to the other end ofthe arm in the same manner as the screw shank 54.

A scraper 58 is also provided for the wheel 7, and this end of the sawalso has a guide wheel 59. These parts are arranged and supported in thesame manner as the scraper 51 and the guide wheel 52, they being carriedat the ends of a cross-arm 60 supported by the plate 19.

As the saw 5 cuts one way only it throws the bone dust ahead and keepsthe meatclean. The saw also does not pull loose pieces back and hence itdoes not jump to cut the operators fingers, which very often happenswith a reciprocating hand saw. The saw is also readily controlled and itcan be instantly started and stopped at will.

We claim:

1. A band saw machine comprising an inverted Ushaped frame havingdownwardly extending legs, a band wheel support pivoted on one of thelegs of said frame, a band wheel carried by said support, a tiltingmember pivoted to the remaining leg of the frame and having anupstanding lug projecting above the pivot ot said member, an adjustingscrew passing through the frame and enga ing said lug, a slide on saidtilting mem er provided with a bearing at one end and an upstanding lugat the other, guides on the tilting member for guiding said slide inmovement toward and from the first mentioned band wheel support, an armprojecting upwardl from the outer end of the tilting member, anadjusting screw passing through said arm and screwed into the lug on theslide whereby to move the slide in its guides, a. shaft mounted in saidbearing, a band wheel mounted on said shaft, and an arm band extendingupward from the rear end of the tilting member whereby the hand may beslid through the arm band to grasp the frame and manipulate the same.

2. A band saw machine comprising an inverted U-shaped frame havingdownwardly extending legs, a band wheel support pivoted on one of thelegs of said frame, a band wheel carried by said support, a tiltingmember pivoted to the remaining leg of the frame and having anupstanding lug projecting above the pivot of said member, an adjustingscrew assing through the frame and engaging said lug, a slide on saidtilting member provided with a bearing at one end and an upstandiug lugat the other, guides on the tilting member for guiding said slide inmovement toward and from the first mentioned band wheel weasel Qsupport, an arm projectingupward from the late the same; in combinationwith means outer end of4 the tilting member, an adjustfor supporting theframe for free move ing screw passing through said arm and ment fromoverhead including a pulley.l a screwed into the lug on the slidewhereby to counterbalance weight, and a flexible con- ,5 move the slidein its guides, a shaftmounted nection between said counter-balanceweight E@ in said bearing, a band wheel mounted on and theframeextending over said pulley.

said shaft, an arm band extending upward In testimony whereof we ax oursignafrom the rear end of the tilting member tures..v

whereby the hand may be slid through the v DANEL F. GREEN. l0 arm bandto grasp the frame and manipu- JOHN F. STEDMAN.

